i've recently started trying to Di with my Zoom G2.1u Multi Effects pedal. i've installed the Asio driver and installed the device and stuff.

So i plug it in Via USB 2.0, bring up Cubase 5, start new project, do all the Asio, assign input/output crap. Then when i insert a send to Amplitube 3 or Guitar Rig 4 it starts making this crackling noise after about 2 minutes of using it.

if someone could help it would be much appreciated .